feat: split test detail into employee view and author view

- /tests/:id — employee view, answers shown without correct/incorrect markers
- /tests/:id/edit — author view, correct answers highlighted + edit button (disabled until Sprint 4)
- TestList: add 'Изменить' button linking to author view

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -6,6 +6,7 @@ import { BrowserRouter, Route, Routes } from 'react-router-dom'
 import AttemptResult from './pages/AttemptResult'
 import TestCreate from './pages/TestCreate'
 import TestDetail from './pages/TestDetail'
+import TestEdit from './pages/TestEdit'
 import TestList from './pages/TestList'
 import TestTake from './pages/TestTake'
 
@@ -20,6 +21,7 @@ export default function App() {
             <Route path="/" element={<TestList />} />
             <Route path="/tests/create" element={<TestCreate />} />
             <Route path="/tests/:id" element={<TestDetail />} />
+            <Route path="/tests/:id/edit" element={<TestEdit />} />
             <Route path="/tests/:testId/take" element={<TestTake />} />
             <Route path="/attempts/:attemptId/result" element={<AttemptResult />} />
           </Routes>

frontend/src/pages/TestDetail/index.tsx

@@ -1,4 +1,4 @@
-import { ArrowLeftOutlined, CheckCircleTwoTone, CloseCircleTwoTone, PlayCircleOutlined } from '@ant-design/icons'
+import { ArrowLeftOutlined, PlayCircleOutlined } from '@ant-design/icons'
 import { useQuery } from '@tanstack/react-query'
 import { Button, Card, Descriptions, List, Space, Spin, Tag, Typography } from 'antd'
 import { useNavigate, useParams } from 'react-router-dom'
@@ -78,14 +78,7 @@ export default function TestDetail() {
             dataSource={question.answers}
             renderItem={(answer: Answer) => (
               <List.Item style={{ padding: '4px 0' }}>
-                <Space>
-                  {answer.is_correct ? (
-                    <CheckCircleTwoTone twoToneColor="#52c41a" />
-                  ) : (
-                    <CloseCircleTwoTone twoToneColor="#d9d9d9" />
-                  )}
                 <Text>{answer.text}</Text>
-                </Space>
               </List.Item>
             )}
           />

frontend/src/pages/TestEdit/index.tsx

@@ -0,0 +1,118 @@
+import {
+  ArrowLeftOutlined,
+  CheckCircleTwoTone,
+  CloseCircleTwoTone,
+  EditOutlined,
+  PlayCircleOutlined,
+} from '@ant-design/icons'
+import { useQuery } from '@tanstack/react-query'
+import { Alert, Button, Card, Descriptions, List, Space, Spin, Tag, Typography } from 'antd'
+import { useNavigate, useParams } from 'react-router-dom'
+
+import { Answer, testsApi } from '../../api/tests'
+
+const { Title, Text } = Typography
+
+export default function TestEdit() {
+  const { id } = useParams<{ id: string }>()
+  const navigate = useNavigate()
+
+  const { data: test, isLoading } = useQuery({
+    queryKey: ['tests', id],
+    queryFn: () => testsApi.get(Number(id)).then((r) => r.data),
+  })
+
+  if (isLoading) {
+    return <Spin size="large" style={{ display: 'block', margin: '48px auto' }} />
+  }
+
+  if (!test) return null
+
+  return (
+    <div style={{ maxWidth: 820, margin: '0 auto', padding: 24 }}>
+      <Space style={{ width: '100%', justifyContent: 'space-between', marginBottom: 16 }}>
+        <Button icon={<ArrowLeftOutlined />} onClick={() => navigate('/')}>
+          К списку тестов
+        </Button>
+        <Space>
+          <Button
+            icon={<EditOutlined />}
+            disabled
+            title="Редактирование будет доступно в следующем спринте"
+          >
+            Редактировать
+          </Button>
+          <Button
+            type="primary"
+            icon={<PlayCircleOutlined />}
+            onClick={() => navigate(`/tests/${test.id}/take`)}
+          >
+            Пройти тест
+          </Button>
+        </Space>
+      </Space>
+
+      <Alert
+        type="warning"
+        showIcon
+        message="Вид автора — правильные ответы отмечены"
+        style={{ marginBottom: 16 }}
+      />
+
+      <Title level={2}>{test.title}</Title>
+
+      {test.description && (
+        <Text type="secondary" style={{ display: 'block', marginBottom: 16 }}>
+          {test.description}
+        </Text>
+      )}
+
+      <Card style={{ marginBottom: 24 }}>
+        <Descriptions column={3}>
+          <Descriptions.Item label="Вопросов">{test.questions.length}</Descriptions.Item>
+          <Descriptions.Item label="Порог зачёта">{test.passing_score}%</Descriptions.Item>
+          <Descriptions.Item label="Таймер">
+            {test.time_limit ? `${test.time_limit} мин` : 'Без ограничений'}
+          </Descriptions.Item>
+          <Descriptions.Item label="Возврат к вопросу">
+            {test.allow_navigation_back ? (
+              <Tag color="green">Разрешён</Tag>
+            ) : (
+              <Tag color="red">Запрещён</Tag>
+            )}
+          </Descriptions.Item>
+          <Descriptions.Item label="Версия">{test.version}</Descriptions.Item>
+          <Descriptions.Item label="Создан">
+            {new Date(test.created_at).toLocaleDateString('ru-RU')}
+          </Descriptions.Item>
+        </Descriptions>
+      </Card>
+
+      <Title level={3}>Вопросы ({test.questions.length})</Title>
+
+      {test.questions.map((question, index) => (
+        <Card key={question.id} style={{ marginBottom: 12 }}>
+          <Text strong>
+            {index + 1}. {question.text}
+          </Text>
+          <List
+            style={{ marginTop: 10 }}
+            dataSource={question.answers}
+            renderItem={(answer: Answer) => (
+              <List.Item style={{ padding: '4px 0' }}>
+                <Space>
+                  {answer.is_correct ? (
+                    <CheckCircleTwoTone twoToneColor="#52c41a" />
+                  ) : (
+                    <CloseCircleTwoTone twoToneColor="#d9d9d9" />
+                  )}
+                  <Text>{answer.text}</Text>
+                </Space>
+              </List.Item>
+            )}
+          />
+        </Card>
+      ))}
+    </div>
+  )
+}

frontend/src/pages/TestList/index.tsx

@@ -1,4 +1,4 @@
-import { PlayCircleOutlined, PlusOutlined } from '@ant-design/icons'
+import { EditOutlined, PlayCircleOutlined, PlusOutlined } from '@ant-design/icons'
 import { useQuery } from '@tanstack/react-query'
 import { Button, Space, Spin, Table, Tag, Typography } from 'antd'
 import type { ColumnsType } from 'antd/es/table'
@@ -64,6 +64,13 @@ export default function TestList() {
           <Button size="small" onClick={() => navigate(`/tests/${record.id}`)}>
             Открыть
           </Button>
+          <Button
+            size="small"
+            icon={<EditOutlined />}
+            onClick={() => navigate(`/tests/${record.id}/edit`)}
+          >
+            Изменить
+          </Button>
           <Button
             size="small"
             type="primary"